Strong On-Chip Microwave Photon-Magnon Coupling Using Ultra-low Damping Epitaxial Y3Fe5O12 Films at 2 Kelvin

TL;DR

This paper demonstrates strong on-chip coupling between microwave photons and magnons in ultralow damping epitaxial Y3Fe5O12 films at 2 Kelvin, advancing scalable hybrid quantum systems.

Contribution

First demonstration of strong magnon-photon coupling in ultralow damping YIG films on a non-rare-earth substrate at cryogenic temperatures.

Findings

Achieved ultralow damping in epitaxial YIG films at 2 K.

Demonstrated strong coupling between magnons and microwave photons.

Enabled potential for integrated quantum information devices.

Abstract

Y3Fe5O12 is arguably the best magnetic material for magnonic quantum information science (QIS) because of its extremely low damping. We report ultralow damping at 2 K in epitaxial Y3Fe5O12 thin films grown on a diamagnetic Y3Sc2Ga3O12 substrate that contains no rare-earth elements. Using these ultralow damping YIG films, we demonstrate for the first time strong coupling between magnons in patterned YIG thin films and microwave photons in a superconducting Nb resonator. This result paves the road towards scalable hybrid quantum systems that integrate superconducting microwave resonators, YIG film magnon conduits, and superconducting qubits into on-chip QIS devices.